Two vibrating pipes in the abandonned school building

Vogelsang's remaining buildings contain many disused rusting water pipes. Most are detached from whatever they were once connected to and easily resonate or vibrate if hit, or even gently pushed. Here two pipes, rising vertically side by side up the wall of a former boiler room, have much self-reinforcing energy when set in motion. They vibrate for a fair amount of time and become slightly louder mid way through.